XML 419 R330.htm IDEA: XBRL DOCUMENT v3.24.1
Fair Value - Information about Significant Unobservable Inputs (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value € 63,638 € 66,959
Recurring fair value measurement [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 257,645 247,151
Financial liabilities at fair value 67,523 60,806
Recurring fair value measurement [member] | At fair value through other comprehensive income [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 50,364 54,223
Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Debt securities [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 47,191 51,607
Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Other investments [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value € 29 31
Level III [member] | At fair value through other comprehensive income [member] | Shares [member] | Net asset value [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Net asset value  
Significant unobservable input n.a.  
Level III [member] | At fair value through other comprehensive income [member] | Shares [member] | Other valuation technique [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Other  
Significant unobservable input n.a.  
Level III [member] | At fair value through other comprehensive income [member] | Debt securities [member] | Broker quote [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Broker quote  
Significant unobservable input n.a.  
Level III [member] | At fair value through other comprehensive income [member] | Debt securities [member] | Other valuation technique [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Other  
Significant unobservable input n.a.  
Level III [member] | At fair value through other comprehensive income [member] | Debt securities [member] | Constant Prepayment Rate [Member] | Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Discounted cash flow  
Significant unobservable input Constant Prepayment Rate  
Level III [member] | At fair value through other comprehensive income [member] | Debt securities [member] | Constant Prepayment Rate [Member] | Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Discounted cash flow  
Significant unobservable input Constant Prepayment Rate  
Level III [member] | At fair value through other comprehensive income [member] | Other investments [member] | Net asset value [member] | Investment funds [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Net asset value  
Significant unobservable input n.a.  
Level III [member] | At fair value through other comprehensive income [member] | Other investments [member] | Other valuation technique [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Other  
Significant unobservable input n.a.  
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Shares [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Net asset value  
Significant unobservable input n.a.  
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Shares [member] | Broker quote [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Broker quote  
Significant unobservable input n.a.  
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member] | Broker quote [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Broker quote  
Significant unobservable input n.a.  
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member] | Other valuation technique [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Other  
Significant unobservable input n.a.  
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member] | Constant Prepayment Rate [Member] | Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Discounted cash flow  
Significant unobservable input Constant prepayment rate  
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] | Net asset value [member] | Investment funds [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Net asset value  
Significant unobservable input n.a.  
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] | Discounted cash flow [member] | Tax credit investments [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Discounted cash flow  
Significant unobservable input Discount rate  
Level III [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] | Other valuation technique [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Valuation technique in assets Other  
Significant unobservable input n.a.  
Level III [member] | Embedded derivatives [member] | Derivatives [member] | Own credit spread [member] | Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Significant unobservable input Own credit spread  
Valuation technique in liabilities Discounted cash flow  
Level III [member] | Other Liabilities [member] | Derivatives [member] | Other valuation technique [member] | Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Significant unobservable input Other  
Valuation technique in liabilities Discounted cash flow  
Level III [member] | Recurring fair value measurement [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value € 5,846 5,392
Financial liabilities at fair value 6 12
Level III [member] | Recurring fair value measurement [member] | Other investments [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 4,947 4,403
Level III [member] | Recurring fair value measurement [member] | Derivatives [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial liabilities at fair value 6 12
Level III [member] | Recurring fair value measurement [member] | At fair value through other comprehensive income [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 530 191
Level III [member] | Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Shares [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 4 4
Level III [member] | Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Shares [member] | Other valuation technique [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 4 4
Level III [member] | Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Debt securities [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 516 181
Level III [member] | Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Debt securities [member] | Broker quote [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 416 33
Level III [member] | Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Debt securities [member] | Other valuation technique [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value € 98 € 147
Level III [member] | Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Debt securities [member] | Constant Prepayment Rate [Member] | Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Range (weighted average) 1.81% 40.53%
Financial assets at fair value € 2 € 2
Level III [member] | Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Other investments [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 9 5
Level III [member] | Recurring fair value measurement [member] | At fair value through other comprehensive income [member] | Other investments [member] | Other valuation technique [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 9 5
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Shares [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 91 126
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Shares [member] | Broker quote [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 4 1
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 180 161
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member] | Broker quote [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value 80 5
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member] | Other valuation technique [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value € 6 € 30
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Debt securities [member] | Constant Prepayment Rate [Member] | Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Range (weighted average) 7.10% 7.80%
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value € 4,237 € 4,050
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] | Net asset value [member] | Investment funds [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial assets at fair value € 3,532 € 3,439
Level III [member] | Recurring fair value measurement [member] | Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Other investments [member] | Discounted cash flow [member] | Tax credit investments [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Range (weighted average) 6.88% 7.10%
Financial assets at fair value € 705 € 610
Level III [member] | Recurring fair value measurement [member] | Embedded derivatives [member] | Derivatives [member] | Own credit spread [member] | Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Range (weighted average)   0.45%
Financial liabilities at fair value 3 € 8
Level III [member] | Recurring fair value measurement [member] | Other Liabilities [member] | Derivatives [member] | Other valuation technique [member] | Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]    
Financial liabilities at fair value € 3 € 4